Shears for cutting metal bolts



UNITED STATES PATENT OFFICE.

\VILLIAM ROBINSON, OF OHURDAN, IO\VA.

SHEARS FOR CUTTING METAL BOLTS.

SPECIFICATION forming part of Letters Patent N o.- 403,961, dated May28, 1889.

Application filed January 26, 1889. Serial No. 297,716- (No model.)

To all whom it may concern:

Be it known that I, XVILLIAM ROBINSON, a citizen of the United States,residing at Churdan, in the county of Greene and State of Iowa, haveinvented new and use f ul Improvements in Shears for Cut-ting MetalBolts, &c., of which the following is a specification.

The invention relates to in'iprovelnents in shears for cutting metalbolts, &c.; and it consists in a certain novel construction andcombination of devices, fully described hereinafter in connection withthe accompanying drawings, and specifically pointed out in the appendedclaim.

In the drawings, Figure l is a perspective view of shears embodying myimprovements. Fig. 2 is a side view of the same, showing the jaws open.Fig. Sis a detail perspective view of the base.

Referring by letter to the drawings,A desi gnates the base, which isarranged on a table or stand, B, of any suitable form and constructionto sustain the operating parts of the shears. This base is provided witha central elevated portion, a, and depressed portions a a on oppositesides thereof, the said depressed portions being perforated to receivethe securing-bolts b b. This base is also provided at one end with theupwardly-projecting parallel ears O 0, between which the operating-leverD is pivoted, the pivot-bolt (Z being arranged in perforations in thesaid ears.

E represents a blade-carrying lever, which is pivoted near its center tothe elevated portion of the base by the pivot-bolt e, and it extendsrearwardly and upwardly until its extremity is above the inner end ofthe operating-lever, to which it is connected by the links F F. Theselinks are arranged, respectively, on opposite sides of the said leversand are pivoted thereto by suitable transverse bolts,

f and f.

The blade-carrying lever is provided at its front end with acutting-knife, G, which is mortised in the lever and secured thereto bymeans of bolts in the ordinary manner, and a similarcutting-knife, G, ismortised in the forward end of the base to act in conjunction with theknife G.

The links which connect the rear upwardlybent end of the blade-carryinglever to the operating-lever are connected to the latter close to itspivot, so as to afford as great leverage as possible, and when theshears are in the act of cutting the links are in an approximatelyvertical position and press the rear end of the blade-carryiug leverupward; hence the advantage in bending the rear end of the saidblade-carrying lever upward.

The outer end of the elevated portion a of the base beyond the pivot ofthe bladecarrying lever, to Which the knife G is secured, is inclinedalong its upper edge, whereby a similar inclination may be given to thecutting-knife, and the said pivot is arranged slightly below the upperedge of the knife G, whereby a shear action is imparted to the knives incutting.

Having thus described the invention, I claim In metal-shears, thecombination, with the base A, provided with the intermediate elevatedportion, a, carrying a stationary knife, G, and the depressed perforatedportions a a, near the extremities of the base, of the blade-carryinglever E, fulcrumed to the elevated portion of the base below the levelof the upper edge of the stationary knife and curved upwardly toward itsrear end over the depressed rear end of the base, the operatingleverD,fulcrumed to the base beneath the upwardly-curved end of theblade-carrying lever, and the links connecting the extremities of theupwardly-curved portion of the blade-carrying lever to the shorter armof the operating-lever, whereby an upward thrust is imparted to the endof the blade-carrying lever, substantially as specified.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in presence of two witnesses.

ILLIAM ROBINSON.

\Vitnesses:

RALPH II. IlALLoWAY, (1. E. MORANVILLE.

